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# Robert Demyanovich

Last seen: 5 days ago Active since 2021

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Question

Output the amount of time it took to run a simulation
My simulations take a long time. I would like to be able to measure the amount of time it took for a simulation to run. I woul...

6 days ago | 2 answers | 1

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Question

Semilog plot that includes curve fit
I have used the curve fitting app to generate code to plot the data and the curve fit. I am new to MatLab but it looks like the ...

18 days ago | 1 answer | 0

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Question

Semilog plot in curve fitting tool
I am new to using the curve fitting tool. I have some data that I want to fit a curve to. I have clicked on the curve fitting ...

18 days ago | 1 answer | 0

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Question

Ignore zero values when searching for minimum value in column of matrix
I have the following code to find the minimum value in the last column of matrix cANALY: [tnValueAnaly, tnRowAnaly] = min(cANAL...

19 days ago | 1 answer | 0

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Question

Find the maximum value of a column in a table
I have a spreadsheet that is read into a Matlab table. I need to get the maximum value in column 1. I thought the following wo...

1 month ago | 1 answer | 0

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Question

Highest row number in a table
I am reading an excel spreadsheet into a table in MatLab. The number of rows and columns can vary. I need to find the maximum ...

1 month ago | 1 answer | 0

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Question

Scan a row and replace any values equal to zero
I need to replace any zero values in the columns of a specific row, i +1, of a matrix, cA, with a specific value, say 1E-07. How...

2 months ago | 1 answer | 0

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Question

Sum of Least Squares
I have a table, Check, where I would like to subtract column 6 from column 5 (to obtain a residual) and then square the residual...

2 months ago | 1 answer | 0

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Question

Dimensions of arrays being concatenated are not consistent.
I have no idea why I am getting an error in the following code: FluorDataInd = round(i/TimeFactor)+1 x=[ConcValues{1,1} Co...

2 months ago | 1 answer | 0

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Question

Select a record from a table where an exact value is not provided
I have a table which I will be loading with Excel data (I haven't ever done that, but I think I can just paste data in). My que...

2 months ago | 1 answer | 0

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Question

Initializing all rows with one set of values in one half and another set in the other half
The following line of code works for initializing the first row of an array: cA(1,:)=[cA0*ones(1,(N-1)/2+1),Kw/cB0*ones(1,(N+1)...

2 months ago | 2 answers | 0

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Retrieve curve fit coefficients
I tried using coeffvalues, but all it does is store a bunch of text including the values that I want in a 1x1 something or other...

3 months ago | 0

Question

Retrieve curve fit coefficients
I am using a 4PL function written by someone and available from a MatLab search. I don't understand how to store the curve fitt...

3 months ago | 2 answers | 0

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Question

stop execution of code to check results
Is there a way to stop code from executing so that results can be checked. For example something like if i == 100000 Stop...

3 months ago | 3 answers | 0

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Question

Set upper and lower bounds of for loop
I would like to set the upper and lower bounds of a for loop based on the values of simulation parameters. I'm not sure how to...

3 months ago | 1 answer | 0

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Question

How to handle NAN when summing
I have the following code: for k = 1:N W(i,k)=W1*(cB(i,k))^W2; Fluor(i,k)= cB(i,k)*W(i,k)*dx; end FL = su...

3 months ago | 1 answer | 0

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Question

How to sum a portion of a row in a table and get a single value
How do I sum a portion of a row in a Matlab table and get a single value? For example assume that the row number is i and the c...

3 months ago | 1 answer | 0

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Question

if statement with greater than and less than
The following doesn't seem to be working as intended: if 0 <= MBPosition <= 2*Delta ; Even though MBPosition is within the ran...

5 months ago | 2 answers | 0

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Question

if statement for two arrays
I am programming a chemical reaction. I want to make sure that the amount of product produced does not exceed the amount of ava...

5 months ago | 1 answer | 0

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Question

Run "if" logic on a row
I have the following code for the reaction interface between acid and base (A-acid, B-base,S-salt): dS=k1*cA(i+1,:).*cB(i+1...

5 months ago | 1 answer | 0

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Question

Matlab less than comparison
The Matlab documentation is confusing me. I want to test each cell in a specific row of an array (cA). If that cell has a valu...

5 months ago | 2 answers | 0

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Question

Include value requirement in array multiplication
I currently have the following line of code: dS=k1*cA(i+1,:).*cB(i+1,:)*dt dS is the amount of product S resulting from a reac...

5 months ago | 2 answers | 0

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Question

if statement with ge and &
I don't understand why the following line is producing an error: if j ge 2 & cANALY(i+1,j-1) < 0 j is a scalar and cANALY(...

6 months ago | 1 answer | 0

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Question

"Highlight" a vertical gridline on a figure
I have a figure where the range of x values starts at a negative value and goes to a positive value. I would like to "highlight...

6 months ago | 1 answer | 0

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Question

set xticks by calculation but also force 0 to be displayed
I am setting xticks manually based on user inputs for distance. The plot will span the distance range; for example -1.3E-06 to ...

6 months ago | 2 answers | 0

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Question

string for figure title ignores text after variable
I have the following code while creating a figure: titlestr=sprintf('Time=%6.5f',t(1), 'sec'); title(titlestr); No error...

6 months ago | 1 answer | 0

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Question

min function on two arrays
I've read the documentation on the min function, but still don't understand how it works on two arrays. I have the following: ...

6 months ago | 1 answer | 0

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Question

Sum function on part of an array
I don't understand what the following sum function does. mA=zeros(M,1); mA(1)=sum(cA(1,:))*dx; mA is a column vector, s...

6 months ago | 1 answer | 0

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Question

Initializing 1/2 of a row with one value and the other half with another
I don't understand why the following works. It initializes row 1 of the array c with values of 1 in roughly the first half of t...

6 months ago | 2 answers | 0